Mitsubishi Electronics 100TMU-A, PUHY-80TMU-A - page 44

b Check the refrigerant volume by self-diagnosis using the LED.
Set the self-diagnosis switch (SW1) as shown below and check the past information (history) concerning the
refrigerant volume.
Set SW1 as shown in he figure at right.
If LD8 lights up, it indicates the refrigerant charge abnormal delay state just before emergency stop due to refriger-
ant overcharge (1500).
3Additional Refrigerant Charge Volume
At the time of shipping from the factory, the outdoor unit is charged with the amount of coolant shown in the follow-
ing table, but since no extension piping is included, please carry out additional charging on-site.
Outdoor Unit Model Name PUHY-80TMU-A PUHY-100TMU-A
Refrigerant Charge Volume 6.5kg 9kg
(14lb 6oz) (19lb 14oz)
Calculation Formula
Calculate the additional refrigerant volume by calculating the size of the extension liquid piping and its length units (m)[ft].
Additional Refrigerant Volume (kg) = (0.12 × L1) + (0.06 × L2) + (0.024 × L3) + A
[ (oz) = (1.29 × L1) + (0.65 × L2) + (0.26 × L3) + A ]
L1: Length of ø12.7 (3/4") liquid pipe (m) [ft]
L2: Length of ø9.52 (3/8") liquid pipe (m) [ft]
L3: Length of ø6.35 (1/4") liquid pipe (m) [ft]
A: refer to the calculation table.
In the calculation results, round up fractions smaller than 0.01 kg. (Example: 18.54 kg → 18.6 kg)
1.0oz (653.97oz → 654oz)
(Calculation Table)
Total Capacity of A
Connected Indoor Units kg (oz)
~64 1.5 (53)
65~ 2.0 (71)
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